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Finding the Fourth Proportional to 985.68, 1,478.34 and 369.23

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Solution

The fourth proportional to 985.68, 1,478.34 and 369.23 is: 553.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.68 : 1,478.34 = 369.23 : x
  2. Step 2: Convert to fraction form
    985.68/1,478.34 = 369.23/x
  3. Step 3: Cross multiply
    985.68x = 1,478.34 × 369.23
  4. Step 4: Simplify right side
    985.68x = 545,840.09
  5. Step 5: Solve for x
    x = 545,840.09/985.68
  6. Step 6: Final answer
    x = 553.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.